linux-kernel - Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)

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Date:	Tue, 19 Aug 2008 14:17:11 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Scott Wood <scottwood@...escale.com>,
	Eran Liberty <liberty@...ricom.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Steven Rostedt <srostedt@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)

On Mon, 2008-08-18 at 23:12 -0400, Steven Rostedt wrote:
> On Tue, 19 Aug 2008, Benjamin Herrenschmidt wrote:
> 
> > Ok, so i did a patch, but it doesn't fix the problem. So
> > there's something else whacking on the stack frames.
> 
> Is it 32 bit or 64?  I've tested the 64 bit quite a bit, but not so much 
> the 32 (my powerbook is not usually that stable).

32-bit. Reproduced on powerbook by a user, 440, 750, ...

> You might want to look at the entry.S mcount code too.

Yeah, I had a look, nothing obviously bad there, but I may just
have missed it :-)

Ben.


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